Pressure-gage.



PATENTED JAN. 1, 1907.

.B WG TA SG mm RMU E@ -m WP APPLICATION :FILED APR.23, 1906.

n'WILLIAM H. BRISTOL, NEW YORK, TN. Y.

PnEssuE-GAGE.

Specicaton'of Letters Patent.

Patented Jan. 1, 1907.

Application filed April 23, 1906. Serial lilo( 313,238.

. To @ZZ whom t may concern.:

lro

and variations thereof, and particularly to pressure indicating andrecording devices in l which the motion of an expansible chamber or diahragm is multiplied to indicate or record t e existing pressures. i

- 'n'. For this purpose my invention consists, es-

sentia'lly, in the combination, with an expansible chamber, of anindicating or recording arm directly acted upon by said expansiblechamber and means in connection with said arm to cause angular motionthereof upon the expansion of said chamber.

It has for its object to provide a4 device simple in its constructionand extremely sensitive to small variations of pressure andl which maybe constructed to measure high as Well as low pressures.

The nature of my invention will be best understood in connection withthe accompanying drawings, in which- Figure 1 is a front elevation,partly in section, of my improved-pressure indicating and recordingdevice. Fig. 2 is an enlarged side elevation. Fig. 3 is a viewillustrating a modification. i 'l l Similar characters of referencedesignate corresponding parts throughout the several vlews. l

Referring now to the drawings, 10 is a suitable case containing theexpansible chamber 11 and the usual clock-actuating mechanism to revolvethe recordsheet 12, upon which a record of the pressure is to be made. v

13 is a connecting-pipe through which the fluid-pressure to be measured1s communicated to the instrument.

14 is a perforated head secured to the case 10 and through which thepipe 13 passes to the chamber 11. The said chamber 1l is preferably madeof several perforated diaphragms 15, as shown in Figs. 1 and 2, orsimply of a casing with a single diaphragm or flexible top, as in Fig.8. To the upper diaphragmof the series or to the flexible top 15 isattached an arm-piece 16, perferably U- shaped. To the upper extremitiesof this armiece vare secured restraining-pieces `17, whic "injturn areattached below the said points of attachment to arm-piece to some fixedpoints of the casing or the chamber. I may make the pieces 16' and '17rigid links pivotally connected to each other and to the dia hragm andcasing, respectively, as shown in Fig. 3. I prefer, however, to pivotthe arms 16 tothe expansible chamber and to the arms 17 and to fastenthe arm 17 to the casing, but form said arms 17 of flexible strips ofmetal. In using the flexible strip or spring-pieces, as shown in Fig. 2,I obtain a greater proportionate deflection, and the pieces act assprings to promptly return the diaphragm upon a decrease of pressure.The pieces 17 are attached to the'casing or ex ansible chamber in aposition slightly out of ine with the piece 16, thereby positivelydetermining the direction of deflectlon.

I do not wish to restrict myself, however, to any particular means ofattaching the armpiece or the restraining-pieces, as my inven-` tionconsists in` so restrainin the vertical tendency of said armiece tiat itwill be caused to move angular y when the chamber expands.

The action may be termed a kind of differential expansion between thearm-piece .16 and the restraining-arms 17, the former bending overbecause of the restraining action of the latter. The indicating orrecording arm may be attached to 0r be an extension of either thearm-piece 16 or of the restraining-piece 17, the greater deflection,"however, being produced when the indicating or recording arm is attachedto -or is an extension of the arm-piece 16.` If both the arm-piece 16and the restraining-piece 17 are rigid links and I rigidly connected toeach other, it is immaterial to which of the arms the indicating or therecording arm be connected. y

What I- claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. In a pressure indicating or recording device: an expansible chamber;an indicatingv or recording arm attached thereto; and means attached tosaid arm and to a fixed support` below said latter point 'of attach- IOOnient adapted to cause angular motion ol' the said arm upon theexpansion of the expansibie chamber.

2. in a pressure indicating or recording device: an expansible chamber;an indicating or recording arm pivotally attached thereto and meansattached to said arm and to a ixed support below said latter point ofattachment adapted to cause angular motion of the said arm upon theexpansion of thc expansible chamber. 4

3. In a pressure indicating or recording device: an expansible chamber;an indicating or recording arm, one end of which is directly acted. uponby said expansible chamber; and flexible means directly connected tosaid arm and independent of said chamber adapted to cause angular motionof the sad arm upon the ex ansion'of the expansible chamber.

4. n a pressure indicating or recording device: an expansible chamber;an indicating or recording arm attached thereto and {lexible meansdirectly connected to said arm and independent of said chamber adaptedto cause angular motion of the said arm upon the eX ansion oftheexpansible chamber.

5. l ln a pressure indicating or recording device: an expansiblechamber; an indicating or recording arm pivotally attached thereto; andiiexible means directly connected to said arm and independent of saidchamber adapt' ed to cause angular motion of the said arm upon theexpansion of the expansiblc chamber.

y 6. In a pressure indicating or recording de.

ing or reco dng arm, one end of which is directlyacte( "upon by saidexpansible chamber; and lexible means directly connected to said arm andlindependent ot' said chamber adapted to caiis-e angular motion of hesaid arm upon the expansion oi" the expansible chamber.

7. in a pressure indicating or recording dcvice: an expansiblc chambercomprising one or more Iiexiblc diaphragmev an indicating or recordingarm, one cnil of which is directly acted upon by said expansiblechamber' and flexible means directly connected to said arm andindcpcndcnt ol sa'id chamber adapted to cause angular motion of thc saidarm upon tbc. expansion oll tlc expansiblc chamber.

5. In a prcf-isuri'i indicating or rccmding dcvice: an cxpansiblcchamber; an indicating or rccoi'dim arm, onc cnd oi' which is dirci-Il)vaci-zi upon by said cxpansibic chamber; :nul flexible means directlyconnected to said .-rm and independent oiA said chamber io rcst rain thevertical tendency of said arm and thcrci bv causc angular motionthcreo-i` upon the cxninsion ol` the cxpansible chamber.

lzi a prcssnrc indu ating or rqcording device ibo combination with anexpnnsiblc and to a fixed support, said piece being adapted to causeangular motion of said arm upon the expansion of the expansible chamber.v ,l

11. In a pressure indicating .or recording device: the combination Withan expansible f chamber, of a rigid .indicating or recording arm.pivotally attached thereto; and a flexible restraining-piece pivotallyattached to said arm kand attached to a fixed support, said piecebeingadapted to cause angular motion of said arm upon the expansionofthe expansible chamber. Y

l2, In a pressure indicating or recording device: the combination With.an expansible chamber, of an indicating or recording arm with U-shapedend directly acted upon by said expansible chamber; and tworestraining-pieces attached to said arm and to a fixed support, saidpieces being adapted to cause angular motion of said arm upon theexpansion of the expansible chamber.

13. In a pressure indicating 0r recording device the combination With anexpansible chamber, of an indicating or recording arm with U-shaped endpivotally attached thereto; and Atworestraining-pieces attached to saidarm and to a iiXed support, said pieces being adapted to cause angularmotion of said arm upon the expansion of the expansible chamber.

14. In a pressure indicating or recording device: the combination withan eXpansible chamber of an indicating or recording arm with U-sliapedend directly acted upon by said cxpansible chamber; two flexiblerestraining-pieces attached to said arm and to a ixcd support, saidpieces being adapted to cause angular motion of said arm upon theexpansion of thc"expansible chamber.

l5. ln a pressure indicating or recording dcvice: the combination withan expansible chamber, of an indicating or recording arm with U-shapcdend pivot ally attached thereto; and two lcxiblc rcstraining-piecesatiachcd to said arm and to a lixcd support, said pieces being adaptedto cause angular motion ol said arm upon the expansion oll thecxpansiblc cham ber.

le. ln a prcssure indicating or recording dci/icc: thc combination withan expansible chambeof an indicating or recording arm Signed at NewYork, in the county of New 'with U-shaped end vdirectly acted upon byYork and State of New York, this 21st day of 1o said expansible chamber;and two flexible Apri1,A. D. 1906.

restrening-peees pvotaly attached to said erm and attached to a. fixedsup ort, said WILLIAM H' BRISTOL' pieces being adapted to cause angu ermotion Witnesses:

of said arm upon the expansion of the ezc- FREDK. F. SCHUETZ,pansiblechamber. SALLY O. YUDIZKY.

